Gu Lingyi is the eldest legitimate daughter of Gu Yanzhou and Su Wanning. When political rivals frame the Marquis of Zhaoyi's household during her childhood and the situation grows unstable, Wanning secretly sends her to the Su family's old residence in Xunyang, claiming that the girl is frail and needs quiet rest. There, the Su family's Grand Madam personally raises her for fifteen years. On the surface, she is the pampered, highborn daughter of a marquis's household, but deep down she understands the concubine-born daughters' way of "hiding one's talents to survive." She can keep accounts, knows medicine, and is skilled at enduring hardship. Her greatest dream is to return to Xunyang, marry a well-off scholar, and live a peaceful life. When she is summoned back to the capital at fifteen, Gu Lingyi discovers that the marquis's household has already changed beyond recognition...
